A voice assistant, as a service

Put a real voice
in your app.

Vesper listens, understands and answers out loud — in her own British voice. She's already built, hosted and maintained. You add one API key and ship her this week.

Get an API key See the integration
From £99 a month Live in an afternoon No model to train, host or maintain
Hear her Her real voice, running in production today — not a demo reel.
How it works

One key. That's the integration.

You never host her, train her or maintain her. Your app posts what your user said; Vesper sends back what to say, and the audio to play.

01

Pick a plan

Choose your monthly volume and create an account. No sales call, no procurement.

02

Take your key

You get a key straight away. It's the only credential your app needs.

03

Send her a line

One request per turn. Text back, and audio in her voice if you want her to speak.

04

She improves on her own

Every improvement we make reaches your app instantly. You ship nothing.

What your users get Real exchanges, running in production today.
They say“Vesper, what have I missed?”

Three new messages and two people liked you back. Rachel answered about Saturday.

They say“Help me reply to her.”

Try this: “Saturday works. Shall I book somewhere near the bridge?” Want it warmer?

They say“I’m home.”

Good. I’ve let Mum know you’re back and closed your check-in.

Pricing

Pay for what she says.

Speaking is what costs, so speaking is what's metered. Text is bundled generously because it's nearly free. No seat fees, no minimum term.

Pilot
£99 /month
One app finding out whether their users talk to her.
  • 5,000 spoken replies
  • 50,000 text replies
  • Vesper's own voice
  • Email support
Start on Pilot
Studio
£349 /month
A live app with real daily voice use.
  • 25,000 spoken replies
  • 250,000 text replies
  • Your name on her
  • Same-day support
Start on Studio
Platform
£999 /month
An app shipping her to a whole user base.
  • 75,000 spoken replies
  • 1,000,000 text replies
  • White-label, plus a DPA
  • 99.5% uptime target
Start on Platform
Enterprise
From £2,500 /month
Dedicated capacity, your own voice, a signed SLA.
  • Dedicated quota pool
  • Custom voice and tuning
  • Security review and DPA
  • Named contact
Talk to us
Overage £14–22 per 1,000 spoken replies, by plan Setup £750 one-off, waived on annual Annual two months free Custom voice +£299 a month
What you're actually buying

A finished assistant, not a model.

She has her own voice

Not the handset's

A stock iPhone ships one British English voice — a man, at the flat compact grade. Android ships a neural British woman. An assistant that asks the handset for a voice sounds like a different person on every device.

Vesper is synthesised centrally, so she is the same voice on iPhone, Android and the web — identical in every install of your app.

You see and cap everything

Your dashboard

Every request, by key and by day. Set a ceiling so a runaway loop can never run up your bill, and rotate or revoke a key the moment you need to.

Per dayUsage and spend, by key
Hard capsRefuses before it spends, never after
InstantRevoke a key and it stops that second

She takes a bad night seriously

Safety, included

Vesper listens for the ways people actually say they're in trouble, in 34 languages, and answers with the helplines for the country the user is in. She tells struggling and crisis apart, because a safety net that answers everything with a helpline is one people stop trusting.

2,273Crisis phrases she listens for
34Languages covered
By countryReal helplines, not one global number
The licence, in plain English

What you get, and what you don't.

You rent access, not VesperA licence to call her for as long as you're subscribed. She stays ours.
No copying or resellingYou can't reverse-engineer her, or resell access on to somebody else.
She keeps improvingWe update her when we choose to, and your app gets it without shipping.
30 days' notice on priceRates can change, but never without a month's warning first.
Supported, not warrantedProvided as-is, and supported properly. Enterprise adds a signed SLA.
Your users stay yoursWe process their words to answer them. Platform and above includes a DPA.
Get started

Ship her this week.

Pick a plan, take your key, and have Vesper answering your users before the end of the day.

Create your account
Not sure which plan

Tell us roughly how many people use your app each day and we'll say which tier fits, and which one you'd grow into. If Pilot is too big to start with, say so.